Jenny Mccarthy fears boyfriend Jim Carrey's bid to become chubby Three Stooges character Curly will set her off on a doughnut diet. .

The actress/model has confirmed Carrey is preparing to get 'in shape' to play the larger-than-life Stooge, opposite Sean Penn and Benicio del Toro, and he has warned his toned girlfriend to be prepared to date a bigger Jim.

She says, "He said, 'You know, I’m going to have to gain 40 to 50 pounds for this role.’"

But McCarthy is thrilled: "I said, ‘Oh my God! I get to be dating Curly! That is the greatest thing ever.'"

The actress is only worried that she might join Carrey on his binges.

She tells news show Access Hollywood, "I hope I don’t have sympathy weight - he’s going to be eating doughnuts."